地震折射波资料解释中射线方法应用的进一步探讨

开鲁陆家堡凹陷内断裂发育、构造复杂,垂直于构造走向跨度30km,凹陷边缘和凹陷内古生界基底顶板埋深分别为1km和5km,在此开展了基底折射波地震勘探。在已知资料基础上,我们用多段倾斜单界面折射波正演理论计算作指导,设计了野外试验和初步的生产观测系统,t_0和差异时距曲线解释方法对于应用于如此复杂的构造地区其准确性和精度受到了限制。因此,我们在解释方法上试做了如下工作:①多段倾斜单界面折射波理论正演走时拟合,给出较有益的反演解释结果;②二维非均匀介质中射线追踪解释方法,提供准确的射线途径给出基底面上下详尽的更为符合实际的二维速度分布信息。

FURTHER RESEARCH APPLYING RAY METHOD TO REFRACTION SHOOTING

There exist developing faults and complicated structure in Lujiabao concave of Kailuarea. There the basal refraction shooting was carried out. On the basis of theoretical com-putation in respect to refracted wave along single tilted interface with multi-segment aswell as the known data. field experiment and tentative Production observational systemwere designed. Because the accuracy applied t_0 and T-D curve methods were restricted forso complicated structure our interpretation Procedure has been improved in the followingway: 1. completing theoretical travel time fitting and giving appropriate inversion interpre-tation. 2. making use of interpretation procedure of the ray tracing in non-homogeneousmedium in 2-D and providing more precise ray path.